afc.nn {afc} | R Documentation |
Routine to calculate the Generalized Discrimination Score (aka Two-Alternatives Forced Choice Score 2AFC) for the situation of polychotomous observations (nominal) and polychotomous forecasts (nominal)
afc.nn(obsv, fcst, m = 3)
obsv |
vector with polychotomous observations (values in 1,..,m) |
fcst |
vector of same length as obsv with polychotomous forecasts (values in 1,..,m) |
m |
number of observation and forecast categories (default = 3) |
This routine applies Eq.15 of Mason and Weigel (2009) to calculate the 2AFC.
p.afc |
Value of Generalized Discrimination (2AFC) Score |
Andreas Weigel, Federal Office of Meteorology and Climatology, MeteoSwiss, Zurich, Switzerland
S.J. Mason and A.P. Weigel, 2009. A generic verification framework for administrative purposes. Mon. Wea. Rev., 137, 331-349
#Forecasts and observations of Nino-3.4 index
#Load set of polychotomous observations and polychotomous forecasts (4 categories)
data(cnrm.nino34.mm)
obsv = cnrm.nino34.mm$obsv
fcst = cnrm.nino34.mm$fcst
#Calculate skill score
afc.nn(obsv,fcst,4)